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FEATURES£ºThe auxiliary objective lens use 42mm/5 . 5in installation interface ,working distance is 140mm/1 . 7in ,can be directly installed . AND DURABLE£º industrial microscope objective lens uses materials ,durable ,stable performance ,and can be used for a long time . CLEARER FIELD OF VIEW£º0 . 5X microscope auxiliary objective lens can double the total magnification of the microscope and reduce the focaling length .It can effectively expand the observation field and facilitate the observation of the internal structure of small objects . APPLICATION£ºThe auxiliary objective lens is a practical accessory ,easy to install ,and customized single barrel electron microscope . NOTE£ºWe strive to provide you with the highest quality product and the best customer experience .Your nice comment on our product page will be a great encouragement to improve our service .if you're not entirely satisfied ,please just feel to contact us at any time .